Telecom Tutorials by Samir Amberkar

Location Update continued [Under GSM >> Signaling]

Step 2: Authentication, Ciphering

MS

BTS

BSC

MSC

VLR

MAP - Process Access Request

---

VLR1

VLR2

MAP - Send Identification MAP - response for Send Identification

---

MS

BTS

BSC

MSC

VLR

MAP - Authenticate DTAP (Authentication Request) RLM (Authentication Request) SDCCH, MM - Authentication Request SDCCH, MM - Authentication Response RLM (Authentication Response) DTAP (Authentication Response) MAP - Authenticate Response MAP - Set Ciphering BSSMAP - Cipher Mode Command DCM (Encryption Command) SDCCH, RR - Cipher Mode Command SDCCH, RR - Cipher Mode Complete RLM (Ciphering Mode Complete) BSSMAP - Cipher Mode Command MAP - Process Access Accepted

We will continue "Location Update" in next article.

References: GSM Networks book by Heine, GSM book by Mouly and Pautet, Signaling diagrams from 24.007/24.008 (R99).

© Copyright Samir Amberkar 2010

Location Update - 1 «

GSM Index

» Location Update - 3